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targets/TARGET_STM/lp_ticker.c
- Committer:
- amithy
- Date:
- 2017-11-09
- Revision:
- 178:c26431f84b0d
- Parent:
- 154:37f96f9d4de2
- Child:
- 174:b96e65c34a4d
File content as of revision 178:c26431f84b0d:
/* mbed Microcontroller Library ******************************************************************************* * Copyright (c) 2016, STMicroelectronics * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ******************************************************************************* */ #include "device.h" #if DEVICE_LOWPOWERTIMER #include "ticker_api.h" #include "lp_ticker_api.h" #include "rtc_api.h" #include "rtc_api_hal.h" static uint8_t lp_ticker_inited = 0; void lp_ticker_init(void) { if (lp_ticker_inited) return; lp_ticker_inited = 1; rtc_init(); rtc_set_irq_handler((uint32_t) lp_ticker_irq_handler); } uint32_t lp_ticker_read(void) { uint32_t usecs = 0; time_t time = 0; lp_ticker_init(); do { time = rtc_read(); usecs = rtc_read_subseconds(); } while (time != rtc_read()); return (time * 1000000) + usecs; } void lp_ticker_set_interrupt(timestamp_t timestamp) { uint32_t delta; delta = timestamp - lp_ticker_read(); rtc_set_wake_up_timer(delta); } void lp_ticker_disable_interrupt(void) { rtc_deactivate_wake_up_timer(); } void lp_ticker_clear_interrupt(void) { } #endif